This model of the Sony brand as the label comes from China. In its disc compartment nanofiltration

This model of the Sony brand as the label comes from China. In its disc compartment nanofiltration technology can accommodate three cd, cassette player lacks. And has four audio outputs, SPEAKERS SPEAKERS HIGH and LOW. The audio for these different audio outputs Prove what one amplifier circuit, marked on the form as IC 102 and has commercial enrollment STK433-870. This is where the fault originates reported: Here. DIALOGUE WITH CUSTOMER alerted us to the failure to inquire how the client had failed, nanofiltration

technology (veses this because many are the same customers who ocacionan failure) this told us that his son had other speakers connected to different original. A client that was why he appeared in the PROTECT message display. FAILURE, the service procedure and solution. By connecting nanofiltration technology the device to the mains immediately protect the message appeared, there could no longer turn on the computer, disconnecting and reconnecting to the mains repeated the same.
We removed the side covers nanofiltration technology along with the superior, and to have better access to the motherboard which houses both audio ic relay as the two managers to link the audio to the speakers, nanofiltration technology they have a problem that never close its contacts, avoiding damage to the speakers, we removed the back cover also. For this is nesesario remove (unplug) the fan connector located precisely on the back cover (subject). The photograph below shows the card where these components nanofiltration technology are located, nanofiltration technology the audio amplifier relay STK433.870

the relay RY711 and RY701
When connecting the machine to the mains the demo momentarily appeared almost immediately appear nanofiltration technology to protect legend. This small moment when the team tried to turn gave us enough time to do some testing.
Already prepared

and connected team in points relay (RY701) connected nanofiltration technology with the ic audio, connect the computer and instantly appeared also protect 33vcd appeared in both terminals. This is an abnormal condition in these terminals because there should be no voltage

neither positive nor negative. Referring to the diagram these relay terminals are connected to terminals which are 4,5,6,7 output terminals of audio ic. By making nanofiltration technology the test directly on these terminals found equal voltage +33.6 VDC. We find then here the cause for this failure and the apparition of the legend Protect. We proceeded to remove the circuit and make-resistance test between terminals find continuity between terminals 4-7 and the power terminal +33.6 VDC (terminal 3). With this final test we noticed nanofiltration technology that the audio amplifier IC STK433-870 was to blame for the failure. We acquired the audio ic auto parts and place, making it so delicately detailed welding and cleaning very well the terminals to remove any residual fat. Confident nanofiltration technology that this was the absolute solution connect the computer to the mains and surprise, the team remained the same with the same fault. I think that is recurrent and we all had this happen, but if the situation is discouraged because apparently we had everything under control and resolved. And now that. Then again after the tests already made and doubt about the audio ic. Open? Gone bad? Did he short again? What happened?. All tests done again we showed nanofiltration technology that everything was fine. Then locate the point to protect the connector CN 601 (terminal 2). The isolate the circuit and equipment ignited, this allowed us to do other tests, finding nothing abnormal.
We test every circuit protection nanofiltration technology seeking the cause for this failure, the audio circuit and was not the cause, then where was the fault? Rocordamos other repairs which although had changed the audio ic failure persisted and where all external components should be connected (fan). When we opened the team also withdrew the back cover where the fan subject, this had not connected. We weld again protect the terminal and put the lid back connecting the fan to the connector. Having done this perfectly lit team, listen as closed relays giving way to the audio to the speakers. Started to play an audio cd and appeared perfectly. This is a condition already in some teams, that when the fan is not